Deck Stair Calculator
Calculate stair dimensions, riser height, tread depth, and material requirements for your deck stairs. Ensure building code compliance with our free calculator.
Step 1: Stair Dimensions
Building Code Guidelines
Most building codes require riser heights between 6-7.75 inches and tread depths of at least 10 inches. The ideal riser-to-tread ratio is 7.5″ rise to 10″ run.
Step 2: Materials & Options
About Deck Stairs
Proper stair design ensures safety and comfort. Always check local building codes for specific requirements regarding riser height, tread depth, and handrail specifications.
Deck Stair Calculation Results
Total Steps Required
Material Requirements
| Material | Quantity | Dimensions | Notes |
|---|
Cutting List
Stringer Cuts
Each stringer requires cuts for risers and treads. For 7 steps, you’ll need 6 treads. Mark your measurements carefully on 2×12 stringer material before cutting.
Stair Visualization
Stair Calculation Formula
Number of Steps = Total Rise ÷ Desired Riser Height
Round up to nearest whole number, then recalculate actual riser height: Actual Riser = Total Rise ÷ Number of Steps
Total Run = (Number of Steps – 1) × Tread Depth
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